Looks very nice, love the scrolling clouds (strongest point in the scene), although IMO they should be scrolling horizontally. My only other minor crit are the mountains, they could use improvements (more natural looking texture)!
I've been working with Bryce and use my own custom texture created in Photoshop. Bryce is pretty good but has some limits, I would like to get
Vue Espirit with addon for importing animated 3D characters (with editable regions/joints). I also use Poser and DAZ3d. What I've done so far is to build an exterior and interior of a spaceship with 3D characters. I also built a large city (that takes up a lot of memory lol) all the buildings and textures had to be created piece by piece. Yet still I have a heck of lot more to do, its very difficult getting everything just right.